US 11,650,395 B2Granted

Fixed focal imaging lens

AssigneeRays Optics Inc.

InventorsChen-Cheng Lee, Yu-Chia Lu, Ju-Hsin Yang

Life of this patent

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Abstract

A fixed focal imaging lens includes two lens sets and an aperture stop. One of the two lens sets is disposed between a magnified side and the aperture stop. The other one of the two lens sets is disposed between the aperture stop and a minified side. The lens set disposed between the magnified side and the aperture stop includes an aspheric lens and a compound lens, wherein the aspheric lens is a lens closest to the magnified side in the lens set, and the compound lens includes a plurality of lenses combined together. The lens set disposed between the aperture stop and the minified side includes a compound lens and an aspheric lens, wherein the compound lens includes a plurality of lenses combined together, and the aspheric lens is a lens closest to the minified side in the lens set.

Claims18

Dependent claims

A fixed focal imaging lens, comprising the followings sequentially arranged from a magnified side to a minified side:

a first lens set, comprising the followings sequentially arranged from the magnified side to the minified side:
a first aspheric lens, being a lens closest to the magnified side in the first lens set;
and
a first compound lens, comprising a plurality of lenses combined together;
an aperture stop;
and
a second lens set, comprising the followings sequentially arranged from the magnified side to the minified side:
a second compound lens, comprising a plurality of lenses combined together;
and
a second aspheric lens, being a lens closest to the minified side in the second lens set;
wherein the number of lenses with refractive power in the fixed focal imaging lens is 6-8,
wherein the number of aspheric lenses in the fixed focal imaging lens is 2 or 3, and
wherein a distance between every two adjacent lenses in the fixed focal imaging lens is fixed during focusing.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/683,219Filed 13 Nov 2019
Priority: TW 10812651426 Jul 2019
Published: US 2021/0026104 A128 Jan 2021
Granted: 16 May 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G02B 9/34
Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -: having four…
G02B 3/04
With non-spherical faces: with continuous faces that are rotationally symmetrical but deviate from a true sphere , e.g. so called "aspheric" lenses
G02B 3/02
Simple or compound lenses: with non-spherical faces
G02B 9/42
Both - components being meniscus: two - components being compound